Yep. They are there. So what is the 'proper' method to get them out (other than using VI and deleteing the lines?)?
I would comment them out and add another comment like this:
# Un-comment these to disable ipv6 #alias net-pf-10 off #alias ipv6 off
You will need to reboot the server to enable the changes. IIRC, ipv6 is not a module that you can load or unload anytime like a network or sound card driver.